High voltage vacuum
circuit breaker

The OVX1100 and OVX720 series of high voltage vacuum circuit breakers are specially designed solid insulated vacuum circuit breakers modularized in 1-2-3 pole configurations. For railway feeder stations it comes with 1 & 2 poles construction, and with 3 poles for electrical transmission system. The product has extremely high mechanical endurance and outstanding electrical parameters with solid insulation and with high performance vacuum interrupters. This combination provides highly reliable maintenance free products with low life cycle costs. Gas free product, environmentally friendly.

Hughes Power System high voltage circuit breaker
  • Solid insulated bushings
  • High current vacuum interrupters
  • High level of insulation
  • Innovative design
  • Low life cycle cost
  • Easily remotely controlled


Hughes OVX720, a state of art modularized high voltage vacuum circuit breaker for 72kV, is designed and manufactured in Sweden for railway feeder station and electrical transmission system applications.

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Hughes vacuum circuit breaker


The OVX720 has the following key advantages:

  • Solid insulated bushings (1) that exclude risk for SF6 or mix gas leakage and oil leakage;
  • High current vacuum interrupters (2) that will not produce any harmful switching products and are very easy to replace in comparison to gas insulated interrupters;
  • The OVX720 uses high-level insulated bushings (3) with polymeric surface that gives superior BIL rating;
  • The vacuum interrupter has an innovative design because the unit can be modularized between 1, 2 or 3 poles for different applications. Normally 1 and 2 poles versions are used for railway electrification and 3 poles version is used for electrical transmission systems including renewable energy sectors;
  • Low life cycle cost is guaranteed due to the combination of extremely high mechanical endurance and outstanding electrical parameters;
  • The circuit breaker is completely prewired which makes it an easily remote-controlled solution;
Hughes vacuum circuit breaker


  • Solid insulated;
  • 72.5 kV 3-phase;
  • 42 kV single or double pole;
  • 2500 A, 31.5 kA;
  • 365 kV BIL;
  • 140 kV PF@ 50 Hz;
  • Stored energy mechanical actuator;
  • Solutions for 1-phase, 2-phase, 3-phase systems;
  • Vacuum interrupter enclosed in a solid insulation with silicone surface;
  • Anti-vandalism poles fitted with polymeric insulators as standard;
Hughes high voltage vacuum circuit breaker


Hughes vacuum circuit breaker


Description ovx721 ovx722 ovx723
Type circuit breaker circuit breaker circuit breaker
Rated frequency, Hz 50/60 50/60 50/60
Operating voltage (phase to ground), kV 42 42  
Operation voltage (phase to phase), kV     72
Rated power frequency withstand voltage (50 Hz/1 min), kV 140 140 140
Lightning impulse withstand voltage (1.2/50 μs), kV 325 325 325
Rated current, A 2500 2500 2500
Rated short-circuit breaking current, kA 31.5 31.5 31.5
Rated short-circuit making current, kA 80 80 80
Short circuit withstand current 31.5 kA/3 s 31.5 kA/3 s 31.5 kA/3 s
Operation mechanism stored energy stored energy stored energy
Number of poles 1 2 3
Opening time, ms ≤ 17 ≤ 22 ≤ 22
Closing time, ms ≤ 60 ≤ 60 ≤ 65
Insulators polymeric polymeric polymeric
Operating class (IEC 62271-100) E2 E2 E2
Size (HxLxW), mm 1990 x 840 x 620 per module
Operation voltage 24 VDC, 110 VDC, 220 VAC
Drive voltage 24 VDC, 110 VDC, 220 VAC

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